feat/web: Patchset 3 (#455)

https://apifox.com/apidoc/shared-ceda7a60-e817-4ea8-827b-de4e874dc45e

implement all backend API

easytier-web/src/restful/captcha/extension/mod.rs

@@ -0,0 +1,41 @@
+pub mod axum_tower_sessions;
+
+use super::base::captcha::AbstractCaptcha;
+use super::captcha::spec::SpecCaptcha;
+use super::{CaptchaFont, NewCaptcha};
+
+/// 验证码工具类 - Captcha Utils
+///
+/// 默认使用[SpecCaptcha]（静态PNG字母验证码）作为验证码实现，用户也可以指定其他实现了[AbstractCaptcha]的类型。
+///
+/// Use [SpecCaptcha] (static PNG-format alphabetical Captcha) as the default implement of the Captcha service. Users may use other implementation of [AbstractCaptcha] they prefer.
+///
+pub struct CaptchaUtil<T: AbstractCaptcha = SpecCaptcha> {
+    captcha_instance: T,
+}
+
+impl<T: AbstractCaptcha> NewCaptcha for CaptchaUtil<T> {
+    fn new() -> Self {
+        Self {
+            captcha_instance: T::new(),
+        }
+    }
+
+    fn with_size(width: i32, height: i32) -> Self {
+        Self {
+            captcha_instance: T::with_size(width, height),
+        }
+    }
+
+    fn with_size_and_len(width: i32, height: i32, len: usize) -> Self {
+        Self {
+            captcha_instance: T::with_size_and_len(width, height, len),
+        }
+    }
+
+    fn with_all(width: i32, height: i32, len: usize, font: CaptchaFont, font_size: f32) -> Self {
+        Self {
+            captcha_instance: T::with_all(width, height, len, font, font_size),
+        }
+    }
+}